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Construction of solid-liquid interfacial Fenton-like reaction under visible light irradiation over etched CoxFeyO4-BiOBr photocatalysts

Abstract

This work has constructed an in situ Fenton-like photocatalytic system driven by visible light. Firstly, BiOBr, a benign in situ H2O2 producer has been prepared by a simple hydrothermal method. Then, the accelerant (CoFe2O4 nanoparticles as the precursor) for H2O2 decomposition has been loaded onto the surface of BiOBr photocatalysts to build a well contacted interface for reactive sites. CoxFeyO4 nanoparticles etched by different extents were obtained by adjusting the solution pH (pH=1, 3 and 7) during the composites preparation process. Here to a group of green and efficient CoxFeyO4-BiOBr (abbreviated as CFB) (pH=1, 3 and 7) photocatalysts have been synthesized successfully. The optimal CFB materials for BPA photodegradation were 0.5% CFB (pH=3). The reaction rate constant of 0.5% CFB (pH=3) was 3.4 times higher than BiOBr (pH=3). H2O2 concentration detection, ESR and radical trapping experiements demostrated that much of the H2O2 produced by BiOBr (pH=3) have been successfully decomposed to •O2-and •OH, which played an important role with h+ in BPA photodegradation process, thereby a possible photocatalytic mechanism has been proposed. Cycling experiments have indicated a good stability of 0.5% CFB (pH=3) materials. This work may offer a green and efficient method for in situ H2O2 generation and decomposition, thus, the secondary pollution and harsh conditions of conventional Fenton reaction could be tactfully avoided.

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Publication details

The article was received on 18 Sep 2017, accepted on 30 Nov 2017 and first published on 01 Dec 2017


Article type: Paper
DOI: 10.1039/C7CY01915G
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Construction of solid-liquid interfacial Fenton-like reaction under visible light irradiation over etched CoxFeyO4-BiOBr photocatalysts

    T. Zhou, Y. Xu, X. Wang, S. Huang, M. Xie, J. Xia, L. Huang, H. Xu and H. Li, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY01915G

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